What is the official website of Horizon Media ?

The official website of Horizon Media is http://www.horizonmedia.com.

What is Horizon Media's cybersecurity risk score?

Horizon Media has an AI-generated cybersecurity risk score of 710 out of 1000, indicating a Moderate security posture according to Rankiteo's assessment.

How many security incidents has Horizon Media experienced?

According to Rankiteo, Horizon Media currently holds 0 security badges, indicating that no recognized compliance certifications are currently verified for the organization.

Has Horizon Media been affected by any supply chain cyber incidents ?

According to Rankiteo, Horizon Media has not been affected by any supply chain cyber incidents, and no incident IDs are currently listed for the organization.

Does Horizon Media have SOC 2 Type 1 certification ?

According to Rankiteo, Horizon Media is not certified under SOC 2 Type 1.

Does Horizon Media have SOC 2 Type 2 certification ?

According to Rankiteo, Horizon Media does not hold a SOC 2 Type 2 certification.

Does Horizon Media comply with GDPR ?

According to Rankiteo, Horizon Media is not listed as GDPR compliant.

Does Horizon Media have PCI DSS certification ?

According to Rankiteo, Horizon Media does not currently maintain PCI DSS compliance.

Does Horizon Media comply with HIPAA ?

According to Rankiteo, Horizon Media is not compliant with HIPAA regulations.

Does Horizon Media have ISO 27001 certification ?

According to Rankiteo,Horizon Media is not certified under ISO 27001, indicating the absence of a formally recognized information security management framework.

Which industry does Horizon Media operate in ?

Horizon Media operates primarily in the Advertising Services industry.

How many employees does Horizon Media have ?

Horizon Media employs approximately 3,079 people worldwide.

Does Horizon Media own any subsidiaries ?

Horizon Media presently has no subsidiaries across any sectors.

How many LinkedIn followers does Horizon Media have ?

Horizon Media's official LinkedIn profile has approximately 136,891 followers.

What is the NAICS classification code for Horizon Media ?

Horizon Media is classified under the NAICS code 541613, which corresponds to Marketing Consulting Services.

Does Horizon Media have a Crunchbase profile ?

Yes, Horizon Media has an official profile on Crunchbase, which can be accessed here: https://www.crunchbase.com/organization/horizon-media.

Does Horizon Media have a LinkedIn profile ?

Yes, Horizon Media maintains an official LinkedIn profile, which is actively utilized for branding and talent engagement, which can be accessed here: https://www.linkedin.com/company/horizon-media.

How many cybersecurity incidents has Horizon Media experienced ?

As of July 17, 2026, Rankiteo reports that Horizon Media has experienced 1 cybersecurity incidents.

How many peer or competitor companies does Horizon Media have ?

Horizon Media has an estimated 33,349 peer or competitor companies worldwide.

What types of cybersecurity incidents has Horizon Media faced ?

Incident Types: The types of cybersecurity incidents that have occurred include Breach.

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Horizon Media

Boost Score +25 with badge (5 left)

710

/1000

Moderate

735

/1000

Moderate

Horizon Media Vendor Cyber Rating & Cyber Score

horizonmedia.com

cb in

Add Your Compliance Badge

Horizon Media is a leader in driving business-based outcomes for marketers. The company was founded in 1989, is headquartered in New York, and has offices in Los Angeles and Toronto. With estimated billings of $8.7 billion and over 2,300 employees, Horizon is the third largest U.S. media agency according to COMvergence data. Recognized as one of the world’s ten most innovative marketing and advertising companies by Fast Company, Horizon Media has been named Media Agency of the Year by MediaPost, Adweek and AdAge and is known for its highly personal approach to client service. Renowned for its culture, Horizon is also consistently named to all the prestigious annual Best Places to Work lists published by Fortune, Forbes, AdAge, Crain’s New

Horizon Media A.I CyberSecurity Scoring

Scoring History

Horizon Media

Horizon Media CyberSecurity News & History

Past Incidents

Attack Types

Entity

Type

Severity

Impact

Seen

Blog Details

Supply Chain Source

Incident Details

View

Horizon Media

Breach

3/2026

HOR1778106607

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A.I.

Horizon Media Company Scoring based on AI Models

Cyber Incidents Likelihood 3 - 6 - 9 months

Actual

Prediction

Incident Predictions locked

Access Monitoring Plan

A.I Risk Score Likelihood 3 - 6 - 9 months

Actual

Prediction A

Prediction B

Prediction C

Prediction D

A.I. Risk Score Predictions locked

Access Monitoring Plan

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Underwriter Stats for Horizon Media

Incidents vs Advertising Services Industry Avg (This Year)

Horizon Media has 34.64% fewer incidents than the average of same-industry companies with at least one recorded incident.

Incidents vs All-Companies Average (This Year)

Horizon Media has 4.76% fewer incidents than the average of all companies with at least one recorded incident.

Incident Types Horizon Media vs Advertising Services Industry Avg (This Year)

Horizon Media reported 1 incidents this year: 0 cyber attacks, 0 ransomware, 0 vulnerabilities, 1 data breaches, compared to industry peers with at least 1 incident.

Incident History - Horizon Media (X = Date, Y = Severity)

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SUBSIDIARY

Horizon Media Subsidiaries

Horizon Media

Advertising Services

Website: http://www.horizonmedia.com

Company Size: 1,001-5,000 employees

Horizon NextAdvertising Services

Horizon Media CanadaAdvertising Services

Horizon Sports & ExperiencesAdvertising Services

Horizon CommerceAdvertising Services

One HorizonAdvertising Services

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NEWS

Horizon Media CyberSecurity News

Latest updates, reports, and threat intel affecting the global network.

October 02, 2025 07:00 AM

Data protection forecast: what’s on the horizon for in-house teams? (Q4 2025)

A look at what is on the horizon for in-house and compliance teams, including Australia's under-16s social media ban, Norway's cybersecurity...

Read Article

October 01, 2025 07:00 AM

Navigating Australia’s evolving cyber regulatory landscape

We explore the key developments in Australia's cyber regulatory framework, the critical role of boards and directors in cyber risk...

Read Article

September 30, 2025 07:00 AM

Horizon Media, Havas launch Horizon Global to rival ad industry mega-mergers

The news: Horizon Media and Havas are teaming up through a newly announced joint venture, Horizon Global, designed to give both companies...

Read Article

September 30, 2025 07:00 AM

Horizon Media Holdings and Havas form 'Horizon Global' joint venture to serve global marketers

Horizon Media Holdings and Havas announced the formation of Horizon Global, a new joint venture that brings together two of the industry's...

Read Article

September 29, 2025 07:00 AM

Havas and Horizon Media Holdings form $20 billion JV - Horizon Global

Headquartered in New York and spanning over 100 countries, Horizon Global will harness Horizon Media and Havas Media Network's combined...

Read Article

September 29, 2025 07:00 AM

Havas, Horizon Media Form Global Media Joint Venture

Horizon Media Holdings and Havas today announced the formation of a new media-focused joint venture called Horizon Global that will target...

Read Article

September 29, 2025 07:00 AM

Horizon Media, Havas form joint venture to woo global marketers

Horizon Global will focus on U.S.-centric global clients and bring together Horizon's Blu and Havas' Converged.AI platforms.

Read Article

August 07, 2025 07:00 AM

From medieval stronghold to cyber fortress: shielding Europe’s digital future

Czech and Estonian researchers are joining forces to build a cross-border cybersecurity hub that will strengthen Europe's digital defences...

Read Article

July 29, 2025 07:00 AM

Consultation on developing Horizon 2 of the 2023-2030 Australian Cyber Security Strategy

The Australian Government released the 2023-2030 Australian Cyber Security Strategy on 21 November 2023 (the Strategy).

Read Article

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CVE

Latest

Global CVEs (Not Company-Specific)

CVE-2026-44453

SUMMARY

h2o is an HTTP server with support for HTTP/1.x, HTTP/2 and HTTP/3. Prior to commit 6b5370d, h2o is vulnerable to a Denial of Service attack when calling alloca under certain conditions. When serving static files, h2o builds the file path on stack, by calling alloca. The maximum size of the memory allocated using alloca can be as huge as ~600KB, which exceeds the default pthread stack size used by musl libc (128KB). If the amount of memory allocated by alloca exceeds the stack size, the h2o server crashes with a segmentation fault, while it tries to touch the guard page. This issue has been fixed by commit 6b5370d.

Published

Date2026-07-16

Updated

Date2026-07-16

RISK INFORMATION (Score: 7.5)

cvss3

Base Score: 7.5

Complexity: LOW

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Impact Score

3.6

Exploitability

3.9

REFERENCES

CVE-2026-44452

SUMMARY

h2o is an HTTP server with support for HTTP/1.x, HTTP/2 and HTTP/3. Prior to commit 8dc37cb, when h2o receives a ClientHello message over TLS or QUIC and it contains a zero-length SNI extension, the h2o server runs over the zero-length hostname while trying to copy the hostname, assuming that it is NULL-terminated. This is a potential denial-of-service attack vector in sense that it might trigger segmentation violation. This issue has been fixed by commit 8dc37cb.

Published

Date2026-07-16

Updated

Date2026-07-16

RISK INFORMATION (Score: 5.9)

cvss3

Base Score: 5.9

Complexity: HIGH

CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H

Impact Score

3.6

Exploitability

2.2

REFERENCES

CVE-2026-44436

SUMMARY

Quicly is an IETF QUIC protocol implementation intended primarily for use within the H2O HTTP server. Prior to commit 8b178e6, Quicly is vulnerable to a Denial of Service attack through connection state corruption. In QUIC Invariants, the maximum length of a Connection ID is 255 bytes, while QUIC version 1 further restricts the maximum to 20 bytes. Quicly implements QUIC version 1 and therefore its CID buffers are limited to 20 bytes. However, to be able to respond to unknown versions of QUIC, its packet decoder accepts Connection IDs of up to 255 bytes. As its CID buffers are merely 20 bytes long, Quicly must reject QUIC version 1 packets with Connection IDs longer than that. The command line tool bundled with Quicly has had that check, however the library itself lacked such enforcement. As a consequence, when used by applications that lack their own enforcement, the connection state becoming inconsistent to buffer overrun. Fortunately, the overflow stops within the allocated chunk of memory, but nevertheless, the bug leads to assertion failures. This issue has been fixed by commit 8b178e6.

Published

Date2026-07-16

Updated

Date2026-07-16

RISK INFORMATION (Score: 7.5)

cvss3

Base Score: 7.5

Complexity: LOW

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Impact Score

3.6

Exploitability

3.9

REFERENCES

CVE-2026-44435

SUMMARY

Quicly is an IETF QUIC protocol implementation intended primarily for use within the H2O HTTP server. Prior to commit 937d0e9, an assertion failure is raised when the total number of valid handshake messages received over a CRYPTO stream of a single packet number space exceeds 32KB, causing a Denial of Service. This issue has been fixed by commit 937d0e9.

Published

Date2026-07-16

Updated

Date2026-07-16

RISK INFORMATION (Score: 7.5)

cvss3

Base Score: 7.5

Complexity: LOW

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Impact Score

3.6

Exploitability

3.9

REFERENCES

CVE-2026-44434

SUMMARY

Quicly is an IETF QUIC protocol implementation intended primarily for use within the H2O HTTP server. Prior to commit dccf5d4, Quicly was vulnerable to stateless reset injection through lack of packet entry validation. The QUIC protocol is designed to withstand packet injection attacks, once the handshake is complete. Only packets that carry some secret patterns are considered as stateless resets. Quicly allows the peer to share up to 4 such patterns per connection. However, until now, it failed to determine which of the 4 slots that it uses to retain the secret patterns contains a valid entry. As the slots are zero-initialized, the failure meant that, unless the peer advertised 4 of such patterns, an all-zero pattern was treated as a stateless reset.In effect, this allowed an on-path attacker to reset QUIC connections governed by Quicly. This issue has been fixed by commit dccf5d4.

Published

Date2026-07-16

Updated

Date2026-07-16

RISK INFORMATION (Score: 5.3)

cvss3

Base Score: 5.3

Complexity: LOW

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L

Impact Score

1.4

Exploitability

3.9

REFERENCES

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